@media screen and (min-width: 640px) {
  html {
    font-size: 64px !important;
  }
}
* {
  box-sizing: border-box;
}
body,
html {
  width: 100%;
  height: 100%;
}
body {
  min-width: 320px;
  max-width: 640px;
  /* flexible 给我们划分了 10 等份 */
  width: 10rem;
  margin: 0 auto;
  line-height: 1.5;
  font-family: Arial, Helvetica;
}
.top {
  padding: 3.75rem 1.25rem 0;
  width: 100%;
  height: 17.75rem;
  background: -webkit-linear-gradient(-45deg, #6cc9b6, #3979cc) no-repeat;
  border-top: 1px solid transparent;
}
.top .title {
  width: 5.78125rem;
  height: 1.171875rem;
  text-align: center;
  margin: 0.859375rem auto;
}
.top .title h3 {
  font-size: 0.59375rem;
  color: #ffffff;
  font-weight: 400;
}
.top .list {
  width: 100%;
}
.top .list ul li {
  height: 1.1875rem;
  width: 100%;
  font-size: 0.40625rem;
}
.top .list ul li input {
  width: 100%;
  height: 100%;
  border: 1px solid #ffffff;
  border-radius: 0.625rem;
  text-indent: 3em;
  background-color: transparent;
  color: #ffffff;
}
.top .list ul li input::placeholder {
  color: #ffffff;
}
.top .list ul li:nth-child(2) {
  margin: 0.484375rem 0;
}
.top .list ul li:nth-child(3) {
  margin-bottom: 0.296875rem;
}
.top .list ul li:nth-child(3) button {
  width: 100%;
  height: 100%;
  color: #fff;
  font-size: 0.5rem;
  border-radius: 0.5625rem;
  background-color: #56b3f5;
}
.top .list ul li:nth-child(4) {
  height: 0.390625rem;
  text-align: center;
  color: #fff;
}
.top .list ul li:nth-child(4) a {
  font-size: 0.328125rem;
  color: #fff;
}
